Question

1. A researcher wants to see if Alcoholics Anonymous reduces the amount of drinks people consume in a week. Using SPSS and the logic of hypothesis testing, conduct the appropriate test at a .05 significance level.

Before AA	After AA
10	0
9	5
8	2
15	1
9	0
12	2
5	2
4	3
5	1
2	3
5	4
4	2

1. State your hypotheses.

2. Using SPSS, determine the characteristics of the comparison distribution.

3. Determine the cut-off value for a 5% significance level.

4. Using SPSS, determine the observed t score.

5. Decide whether or not to reject the null and give a verbal explanation.

Answer 1

Solution

Since SPSS gives only two tailed significance value so for one tailed we need to divide two tailed significance value by 2 so

The cut-off value for a 5% significance level = 0.001

The observed t score = 3.975

Since the p-value = 0.001 < 5% significance level so  we reject the null hypothesis and conclude that the Alcoholics Anonymous reduces the amount of drinks people consume in a week.